Ranco O12-1549 Pressure Control

The Ranco O12-1549 Dual Pressure Control is a versatile, commercial-grade safety and operational switch designed for HVACR refrigeration units. This dual-function control manages both low pressure cut-out and high pressure safety limits within a single NEMA 1 enclosure. The low-pressure side features a range of 10" Hg to 100 PSI with an adjustable differential of 10 to 40 PSI, while the high-pressure side operates from 150 to 450 PSI with a fixed 65 PSI differential and manual reset capability. Engineered for refrigerant system protection, it utilizes high-strength copper alloy bellows to withstand mechanical vibration and pressure 10% above the set point. The SPST switch configuration ensures reliable compressor cycling and head pressure control. This dual pressure switch is compatible with non-corrosive refrigerants and features standard 1/4" flare nut connections for seamless integration into existing commercial refrigeration systems, providing precise set-point accuracy for contractors requiring durable field replacements.

• Dual Function Integration: Combines low-side control and high-side safety monitoring to reduce component footprint and installation time.
• Manual High-Pressure Reset: Ensures system lockout after a high-head condition, requiring technician intervention for troubleshooting and safety.
• Broad Pressure Ranges: Adjustable 10"/100# low-side and 150/450# high-side settings accommodate various commercial evaporator and condenser requirements.
• Heavy-Duty Construction: Built with a rugged NEMA 1 enclosure and vibration-resistant internals to prevent nuisance tripping in high-vibration applications.
• Universal Compatibility: Standard flare fittings and simplified wiring make it an ideal replacement for diverse refrigeration pressure control setups.

Is the high-pressure cut-out on the O12-1549 automatic or manual reset?
The Ranco O12-1549 is equipped with a manual reset button on the high-pressure side to ensure the system does not restart until a technician verifies the cause of the over-pressure condition.

What is the maximum working pressure for this control?
The high-pressure side is rated up to 450 PSI, making it suitable for systems utilizing common refrigerants where head pressures fall within this operating range.

Can this dual control be used with R-410A systems?
Contractors must verify the specific high-side pressure requirements of the R-410A system; while the O12-1549 handles up to 450 PSI, many R-410A safety limits exceed this range, necessitating a dedicated high-pressure control.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.